-R is for "Run PHP <code> for every input line" $argn is the var that you get from the pipe each time and -E is executed at the End of the feed. you can also add utf8_decode() around the urlencode (for expl. european users with a diff charset)

this script packs everything in /var/www/web1/html (like if you use confixx as panel) into backup.dd.mm.yyyy.tar.gz and if everything is okay it deletes the backup file older then 13 days (2 weeks cycle)